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在自制的无模拉伸机上,研究了无模拉伸温度场的形态及其影响因素,分析了无模拉伸温度场的变化规律,提出以被拉伸线材的最高温度、内部与表面层的温差及变形区轴向温度梯度作为反映无模拉伸温度场形态的特征参数。实验和分析表明:加热线圈和冷却装置的移动速度的增大,使拉伸温度下降,变形区的轴向温度梯度减小。而变形程度的增大,加热线圈与冷却喷嘴间距的减小,使无模拉伸温度下降,增大变形区的轴向温度梯度。在高频感应加热条件下,导磁性材料的拉伸温度受加热线圈和冷却装置的移动速度影响小。
On the self-made dieless drawing machine, the morphology and influential factors of die-free drawing temperature field were studied. The variation of temperature field in die-free drawing was analyzed. The maximum temperature of drawn wire, And the temperature gradient in the deformation zone as the characteristic parameters that reflect the shape of the temperature field of the dieless drawing. Experiments and analysis show that the increase of the moving speed of the heating coil and the cooling device decreases the stretching temperature and decreases the axial temperature gradient in the deformation zone. The deformation degree increases, the heating coil and cooling nozzle spacing decreases, so that no-mold stretching temperature decreases, increasing the deformation zone of the axial temperature gradient. Under high frequency induction heating, the drawing temperature of the magnetically conductive material is less affected by the moving speed of the heating coil and the cooling device.